#6564E6
Closest named color: Dark Periwinkle (#665FD1). oklch(57.5% 0.192 278.8), rgb(101, 100, 230).
Aa
White text reads best on this color (4.64:1).
About this color
#6564E6 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.192 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.033 away. White text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.192) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.51:1 |
| White text | 4.64:1 |
Values
| HEX | #6564E6 |
| RGB | rgb(101, 100, 230) |
| HSL | hsl(240, 72%, 65%) |
| OKLCH | oklch(57.5% 0.192 278.8) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #6564E6 | 4.64:1 | AA | Lc -77.4 | Fine for body text |
| Black text on #6564E6 | 4.51:1 | AA | Lc 32.2 | Non-text elements, placeholder text |
| #6564E6 text on white | 4.64:1 | AA | Lc 71.9 | Content text, not long reading |
| #6564E6 text on black | 4.51:1 | AA | Lc -29.8 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9FB
oklch(93.7% 0.024 278.4)
-
Step 200
200
#D2D7F9
oklch(88.6% 0.047 278.8)
-
Step 300
300
#B4BBF8
oklch(80.8% 0.086 279.2)
-
Step 400
400
#8F96F5
oklch(70.8% 0.138 279)
-
Step 500
500
#7579F1
oklch(63.2% 0.176 278.6)
-
Step 600
600 (this color)
#6564E6
oklch(57.5% 0.192 278.8)
-
Step 700
700
#504CC2
oklch(49.1% 0.179 279)
-
Step 800
800
#413F9D
oklch(42.6% 0.149 279)
-
Step 900
900
#36377D
oklch(37.7% 0.116 278.7)
-
Step 950
950
#202149
oklch(27.1% 0.073 279.3)
#6564E6 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #007AEA | 0.081 |
| Deuteranopia (no green cones) | #006FE3 | 0.076 |
| Tritanopia (no blue cones) | #1D839B | 0.167 |
| Achromatopsia (no color) | #747474 | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6564E6
#6564E6
oklch(57.5% 0.192 278.8)
- #8B7900
#8B7900
oklch(57.5% 0.119 98.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #6564E6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.033
- Medium Slate Blue #7B68EE ΔE 0.037
- Light Indigo #6D5ACF ΔE 0.041
- Slate Blue #6A5ACD ΔE 0.043
- Royal Blue #4169E1 ΔE 0.044
- Neon Blue #4361EE ΔE 0.046
- Warm Blue #4B57DB ΔE 0.052
- Cornflower #6A79F7 ΔE 0.055
Use #6564E6 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.